.input-group {
    margin: 30px 0;
}

.row:last-child > div {
    margin: 20px auto;
}

.input-group {
    position: relative;
}

.input-group .alert {
    display: none;
    position: absolute;
    left: 0;
    top: 46px;
    padding: 6px 20px;
    width: 100%;
}

.btn {
    padding: 6px 24px;
}